JP2012167673A - Method for determining instant when movable element of solenoid valve reaches its end position following energization of solenoid, by means of analysis of switching frequency of solenoid driving current - Google Patents

Method for determining instant when movable element of solenoid valve reaches its end position following energization of solenoid, by means of analysis of switching frequency of solenoid driving current Download PDF

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JP2012167673A
JP2012167673A JP2012095938A JP2012095938A JP2012167673A JP 2012167673 A JP2012167673 A JP 2012167673A JP 2012095938 A JP2012095938 A JP 2012095938A JP 2012095938 A JP2012095938 A JP 2012095938A JP 2012167673 A JP2012167673 A JP 2012167673A
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phase
solenoid
valve
solenoid valve
engine
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Claudio Genta
クラウディオ・ジェンタ
Claudio Lanfranco
クラウディオ・ランフランコ
Alberto Manzone
アルベルト・マンツォーネ
Mitzi Puccio
ミッツィ・プッチョ
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Centro Ricerche Fiat SCpA
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
    • F02D2041/2024—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit the control switching a load after time-on and time-off pulses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
    • F02D2041/2055—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit with means for determining actual opening or closing time
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
    • F02D2041/2058—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit using information of the actual current value

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
  • Magnetically Actuated Valves (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a control method for an electro-hydraulic solenoid valve for controlling a valve of an internal combustion engine of a type called uni-air.SOLUTION: A movable element of a solenoid valve is displaced by means of application to a solenoid of alternating phases at constant voltage and at zero voltage, so as to give rise to an alternation of phases of charging and discharging of the solenoid, corresponding to increases and decreases of a current around a substantially constant current value. The alternating phases at constant voltage and at zero voltage are controlled so that the phase at constant voltage is maintained for a pre-set time and the phase at zero voltage is terminated when the decreasing current reaches a pre-set value. Alternatively, it is possible to envisage that the phase at constant voltage will be terminated when the increasing current reaches a pre-set value and the phase at zero voltage is maintained for a pre-set time. Or else both the phase at constant voltage and the phase at zero voltage will be terminated when the increasing current or decreasing current reaches a pre-set value.

Description

本発明は、一般に、ソレノイドバルブの制御に関する。本発明は、特に、ソレノイドバルブの可動要素がソレノイドの通電に続く移動の端位置に到達する瞬間を決定するための方法に関する。   The present invention generally relates to the control of solenoid valves. In particular, the present invention relates to a method for determining the moment when the moving element of a solenoid valve reaches the end position of movement following energization of the solenoid.

ソレノイドバルブにおいて、ソレノイドへの駆動電流の適切なプロファイルの適用を通じて、ソレノイドバルブの開いた状態及び閉鎖状態に対応する二つの移動の端（end-of-travel）の位置の間で開閉要素の機能を有する可動部（movable part）を動かす（displace）ことは可能である。   In a solenoid valve, through the application of an appropriate profile of the drive current to the solenoid, the function of the switching element between two end-of-travel positions corresponding to the open and closed states of the solenoid valve It is possible to displace a movable part having

本発明に係る方法は、前記移動の端の位置がバルブの閉鎖状態に対応する通常開いたソレノイドバルブと、前記移動の端の位置がバルブの開いた状態に対応する通常閉鎖したソレノイドバルブと、に適用可能である。   The method according to the present invention comprises a normally open solenoid valve in which the position of the moving end corresponds to the closed state of the valve, and a normally closed solenoid valve in which the position of the moving end corresponds to the open state of the valve; It is applicable to.

ソレノイドの通電の瞬間と開閉要素により移動の端の位置への到達との間に経過する時間(作動時間)の計測は、バルブのロバスト（robust）制御のために基本的な重要性を仮定する。前記必要性は、例えば、エンジンの吸気バルブ及び／又は排気バルブの電気油圧式の作動を備えた内燃機関エンジンのコントロールシステムの場合に特に感じられる。前記適用（application）において、エンジンバルブの動作用の装置におけるオイルの通過を調節するソレノイドバルブの動作の時間(開口又は閉鎖の時間として理解される)を制御し続けることは非常に重要である。   The measurement of the time elapsed between the moment of energization of the solenoid and the arrival of the end position of the movement by the switching element (operating time) assumes basic importance for robust control of the valve . This need is particularly felt in the case of control systems for internal combustion engines, for example with electrohydraulic actuation of the intake and / or exhaust valves of the engine. In the application, it is very important to continue to control the time of operation of the solenoid valve (understand as the time of opening or closing) that regulates the passage of oil in the device for engine valve operation.

本発明の特に重要な適用は、本出願人(例えば、特許文献１を参照のこと)によって提案されたユニエアー（UNI-AIR）と呼ばれるタイプの内燃機関エンジンのバルブを制御するための電気油圧式を目的としている（aimed at）。各エンジンバルブに対応して、エンジンのカムシャフトによって駆動されたタペットの動きをエンジンバルブに伝える加圧油圧チャンバが存在し、前記加圧油圧チャンバは通常開いたソレノイドバルブによって排出部（exhaust）と連通している。ソレノイドバルブのソレノイドが通電された（energized）とき、前述の連通が遮断され、前述の加圧油圧チャンバは、油圧で作動カムの動きをエンジンバルブに伝える。ソレノイドが非通電となるとき、加圧された流体は、各戻しバネの結果としてエンジンバルブの迅速な閉鎖をもたらすように前述の加圧油圧チャンバから放出され、それにより、エンジンバルブをその作動カムから独立にする。   A particularly important application of the present invention is an electrohydraulic type for controlling a valve of an internal combustion engine engine of the type called UNI-AIR proposed by the present applicant (see for example patent document 1). (Aimed at). Corresponding to each engine valve, there is a pressurized hydraulic chamber that communicates the movement of the tappet driven by the camshaft of the engine to the engine valve, said pressurized hydraulic chamber being connected to the exhaust by an normally open solenoid valve. Communicate. When the solenoid of the solenoid valve is energized, the aforementioned communication is interrupted, and the aforementioned pressurized hydraulic chamber transmits the movement of the operating cam to the engine valve with oil pressure. When the solenoid is de-energized, the pressurized fluid is released from the aforementioned pressurized hydraulic chamber to result in a quick closure of the engine valve as a result of each return spring, thereby causing the engine valve to move its operating cam. To be independent.

ソレノイドバルブの可動要素が移動の端の位置に到達する瞬間を決定するための方法が既に提案されている。例えば、特許文献２及び特許文献３(本出願人の名で出願されている)を参照すること。前記瞬間は、ソレノイドに供給される、電流及び／又は電圧のプロファイルの分析によって同定される。   Methods have already been proposed for determining the moment when the moving element of the solenoid valve reaches the position of the end of movement. For example, see Patent Document 2 and Patent Document 3 (filed in the name of the present applicant). Said moment is identified by analysis of the current and / or voltage profile supplied to the solenoid.

ヨーロッパ特許出願第1 653 057号（EP 1 653 057 A1）European Patent Application No. 1 653 057 (EP 1 653 057 A1) 国際公開第9413991号（WO-A-9413991）International Publication No. 9413991 (WO-A-9413991) ヨーロッパ特許公開第1 533 506号（EP 1 533 506 A2）European Patent Publication No. 1 533 506 (EP 1 533 506 A2)

本発明の目的は、方法自体を実現するように設計された電子的処理手段とそれに使用されるソフトウェアとの両方の実質的な単純化を可能にし、さらに、電子処理装置をソレノイドに接続するための回路のインピーダンスの変化に本質的に反応しにくい（したがって、容易に制御可能である）、上述したタイプの方法を提供することである。ここで、回路のインピーダンスの変化は、例えば、コネクタの老化（ageing）でもたらされた接触抵抗の変化により、あるいはケーブル長さの起こりうる変化により、起こる。   The object of the present invention is to allow substantial simplification of both the electronic processing means designed to implement the method itself and the software used therein, and also to connect the electronic processing device to the solenoid. It is to provide a method of the type described above that is inherently insensitive to changes in the impedance of its circuit (and is therefore easily controllable). Here, a change in the impedance of the circuit occurs, for example, due to a change in contact resistance caused by connector aging or due to a possible change in cable length.

上記目的を達成するために、本発明の主題（subject）は、ソレノイドバルブの可動要素が、ソレノイドの通電に続く移動の端の位置に到達する瞬間を決定する方法であって、
前記可動要素は、実質的に定電流値を中心にして（around）電流の増加及び減少に対応したソレノイドの充電（charging）での相及び放電（discharging）での相の交番を生じさせるように、定電圧での相及びゼロ電圧での相を交互にすることをソレノイドに適用すること（application）によって移動し、
定電圧での各相が一定時間の間維持されて、減少した電流が所定値に達したときにゼロ電圧での各相が終了するように、あるいは、その代わりに、
増加した電流が所定値に達したときに定電圧での相が終了して、ゼロ電圧での相が一定時間の間維持されるように、あるいは、その代わりに、
増加する電流あるいは減少する電流が所定値に到達するときに定電圧での相及びゼロ電圧での相の両方が終了するように、定電圧での相及びゼロ電圧での相を交互にすることが制御され、
前述の充電相及びその後の放電相から構成された各サイクルの期間は、絶えずモニターされ、前述の移動の端の位置に到達する瞬間は、所定の閾値より長い期間の違いを与える（present）、充電及び放電の二つの連続したサイクルを分離する瞬間として同定される（identified）。 In order to achieve the above object, the subject of the present invention is a method for determining the moment when the moving element of the solenoid valve reaches the position of the end of movement following energization of the solenoid, comprising:
The movable element causes an alternating phase of charging and discharging phase of the solenoid corresponding to an increase and decrease of current substantially around a constant current value. Moving by applying to the solenoid, alternating the phase at constant voltage and the phase at zero voltage,
Each phase at constant voltage is maintained for a certain time so that each phase at zero voltage ends when the reduced current reaches a predetermined value, or alternatively,
The phase at constant voltage is terminated when the increased current reaches a predetermined value, or the phase at zero voltage is maintained for a certain time, or alternatively,
Alternating the phase at constant voltage and the phase at zero voltage so that both the phase at constant voltage and the phase at zero voltage are terminated when the increasing or decreasing current reaches a predetermined value Is controlled,
The duration of each cycle composed of the aforementioned charging phase and the subsequent discharging phase is continuously monitored, and the instant of reaching the aforementioned end of movement gives a difference of duration longer than a predetermined threshold, Identified as the moment separating two consecutive cycles of charge and discharge.

理解されるように、本発明に係る方法は、電流の閾値が到達したかどうかに応じて、二つの工程の少なくとも一つが実行される充電相及び放電相の交番(スイッチング)によって、ソレノイドを流れる電流が始動する（set up）ことを提供するソレノイドバルブの可動要素の動き検出するために用いられる。   As will be appreciated, the method according to the present invention causes the solenoid to flow through alternating charging and discharging phases in which at least one of the two steps is performed, depending on whether a current threshold has been reached. Used to detect the movement of the moving element of the solenoid valve that provides that the current is set up.

上記特徴のおかげで、ソレノイドに提供するための電流及び／又は電圧のプロファイルの分析を通じて同じ目的を達成する既知の方法と比較して、いくつかの実質的な利点が、本発明に係る方法によって達成することができる。特に、周波数の変化の量が検出されたと仮定すると、スイッチングの瞬間の決定に到達するために電圧及び／又は電流の値を正確に分析することは必要ではない。このことにより、信号を処理するために必要なハードウェア及びソフトウェアの相当な低下が可能になる。更に、当該システムは、例えば、コネクタの老化のためにコネクタの接触抵抗の変化や、ケーブル等の長さでの起こり得る（possible）変化のような、ソレノイドへの接続のための回路のインピーダンスの変化に対して本質的にそれほど敏感ではない(したがって、より容易に制御可能である)。   Thanks to the above features, several substantial advantages are achieved by the method according to the invention compared to known methods that achieve the same objective through analysis of the current and / or voltage profile to provide to the solenoid. Can be achieved. In particular, assuming that the amount of frequency change has been detected, it is not necessary to accurately analyze the voltage and / or current values to arrive at the determination of the instant of switching. This allows a substantial reduction in the hardware and software required to process the signal. In addition, the system can be used to reduce the impedance of a circuit for connection to a solenoid, such as a change in connector contact resistance due to connector aging or a possible change in the length of a cable or the like. Inherently less sensitive to change (and therefore more easily controllable).

本発明についてのより良い理解は、制限しない実施例としてのみ提供された添付図面の助けによって得られるだろう。   A better understanding of the present invention will be obtained with the aid of the accompanying drawings provided only as non-limiting examples.

その第一の移動の端の位置からその第二の移動の端の位置に、そして再び第一の移動の端の位置に、バルブの可動要素をもたらすソレノイド駆動電流のプロファイルを示す。FIG. 6 shows a solenoid drive current profile that results in the movable element of the valve from its first movement end position to its second movement end position and again to the first movement end position. FIG. ソレノイドの通電に続く移動の端の位置にバルブの可動要素が到達する瞬間の直前及び直後にソレノイドの充電及び放電のサイクルの期間の変化を示す。The change in the period of the charging and discharging cycles of the solenoid is shown just before and immediately after the moment when the movable element of the valve reaches the position of the end of movement following energization of the solenoid.

上述したユニエアー（UNI-AIR）タイプの、内燃機関エンジンのバルブを可変駆動するためのシステムを制御するためのソレノイドバルブの特定のケースにおいて、ソレノイドそれ自体の通電及び非通電（de-energization）の全サイクル（complete cycle）の間にソレノイドを流れる電流の時間における変化が図１に示されている。ソレノイド駆動電流のプロファイルは、ゼロ電圧(放電相（discharging phase）)と交互にして、定電圧(充電相（charging phase）)によってソレノイドにわたって（across）決定される。   In the specific case of a solenoid valve for controlling a system for variably driving a valve of an internal combustion engine, which is the above-mentioned UNI-AIR type, the solenoid itself is energized and de-energized. The change in time of the current flowing through the solenoid during the complete cycle is shown in FIG. The solenoid drive current profile is determined across the solenoid by a constant voltage (charging phase), alternating with zero voltage (discharging phase).

図示された特定のケースにおいて、ソレノイドバルブの可動要素の移動をもたらす前磁化電流の第一のレベルと、第二のピークのレベルと、可動要素がその移動の端（end-of-travel）の位置に到達した後に可動要素を適所に（in position）維持するための保持電流の第三の低いレベルとが想定されている。   In the particular case shown, the first level of pre-magnetizing current that causes movement of the moving element of the solenoid valve, the level of the second peak, and the moving element at the end-of-travel. A third lower level of holding current is assumed to maintain the movable element in position after reaching position.

到達した電流のレベルは、充電相及び放電相の期間に依存する。特に、電流の一定の平均レベルを維持するために、充電相と放電相との間での迅速な交番(スイッチング)に頼る（recourse）。   The level of current reached depends on the duration of the charge and discharge phases. In particular, in order to maintain a constant average level of current, it recourses to rapid alternation (switching) between the charge and discharge phases.

図１に図示されたケースにおいて、電流のピーク値を中心に切り替わる（switching）領域において、充電相が一定時間の間で行なわれるが、電流の閾値ipeak MINが到達したとき、放電相が中断される（interrupted）。 In the case illustrated in FIG. 1, the charging phase is performed for a certain time in the switching region centered on the peak value of the current, but when the current threshold i peak MIN is reached, the discharging phase is interrupted. Interrupted.

ソレノイドバルブの可動要素の移動(ピーク電流によって供給されたエネルギーの結果として得られる)は、インダクタンスの変化（variation）をもたらす。インダクタンスの変化（variation）は、ソレノイドにわたって（across）電圧の変化に帰着する。前記現象は、知られており、引用された国際公開第9413991号（WO-A-9413991）、及びヨーロッパ特許公開第1 533 506号（EP 1 533 506 A2）において、既に強調されている。   Movement of the moving element of the solenoid valve (obtained as a result of the energy supplied by the peak current) results in a variation in inductance. The variation in inductance results in a change in voltage across the solenoid. This phenomenon is known and already emphasized in the cited WO 9413991 (WO-A-9413991) and EP 1 533 506 (EP 1 533 506 A2).

図２に図示されるように、インダクタンスの前述の変化は、スイッチング周波数の必然的な変化に導く。図から分かるように、充電相は、一定の時間（fixed-time）の制御の下にあるので、インダクタンスの変化の前記現象は、電流が図２においてＢで示された最大値にまだ到達していないとき、図２においてＡで示されたサイクルの第一の（first）シリーズ（series）に対して、充電相が終了する。したがって、サイクルＡの間に、電流が低い閾値Ｃに戻るための時間が短くなる。その代りに、図２におけるサイクルＤにおいて、電流は、充電相のための所定の時間で値Ｂになんとか到達する。その結果、電流が最大値Ｂから閾値Ｃまで戻るための時間が、長くなる。   As illustrated in FIG. 2, the aforementioned change in inductance leads to an inevitable change in switching frequency. As can be seen, the charging phase is under fixed-time control, so that the phenomenon of inductance change still causes the current to reach the maximum indicated by B in FIG. If not, the charging phase ends for the first series of cycles indicated by A in FIG. Therefore, the time for the current to return to the low threshold C during cycle A is shortened. Instead, in cycle D in FIG. 2, the current somehow reaches the value B at a predetermined time for the charging phase. As a result, the time for the current to return from the maximum value B to the threshold value C becomes longer.

もう一度、図２を参照する。グラフＥは、ソレノイドバルブの可動要素がその移動の端の位置に到達する瞬間を正確に同定する目的で実験的に用いられた加速度計（accelerometer）のトレースを示す。図から分かるように、前記瞬間の直前では、ソレノイドの充電及び放電の全サイクルの期間（duration）が、時間t1に等しいが、前述の瞬間直後では、ソレノイドの充電及び放電の全サイクルの期間（duration）が、時間t2（ここで、t2>t1）に等しい。実際上、本発明に係る方法において、ソレノイドの充電及び放電の各サイクルの期間（duration）tは、絶えずモニターされる。また、可動要素の移動の端の位置の到達する瞬間は、充電及び放電の二つの連続したサイクルを分割する瞬間と同一視される（identified with）。それらの期間は、所定の閾値の時間より長い時間で互いに相違している。 Again referring to FIG. Graph E shows an accelerometer trace used experimentally to accurately identify the moment when the moving element of the solenoid valve reaches the end of its movement. As can be seen, immediately before the moment, the duration of the full cycle of charging and discharging the solenoid is equal to the time t 1 , but immediately after the moment, the duration of the full cycle of charging and discharging the solenoid. (Duration) is equal to time t 2 (where t 2 > t 1 ). In practice, in the method according to the invention, the duration t of each cycle of solenoid charging and discharging is constantly monitored. Also, the instant at which the position of the end of movement of the movable element arrives is identified with the instant that divides two consecutive cycles of charging and discharging. These periods differ from each other by a time longer than a predetermined threshold time.

もちろん、電流の最大閾値に到達するときに各充電相が終了して各放電相が一定時間の間維持されるように、あるいは、増加する電流あるいは減少する電流が所定値に到達するときに定電圧での相及びゼロ電圧での相の両方が終了するように、ソレノイドの充電及び放電のサイクルが制御されることになっていた場合においても、同じ結果が得られる。   Of course, each charge phase is terminated when the maximum current threshold is reached, and each discharge phase is maintained for a certain period of time, or when an increasing or decreasing current reaches a predetermined value. The same result is obtained if the solenoid charge and discharge cycles were to be controlled so that both the voltage phase and the zero voltage phase were terminated.

既に上述したように、上述の特徴のおかげで、さらに、例えばバルブのソレノイドと電子制御装置との間での接続における接触の老化（ageing）によって起こり得る外乱（disturbance）に対するシステムの鈍感さ（insensitivity）のおかげで、本発明に係る方法は、方法を実現するように構成された電子的処理手段の単純化の見地から、及び、より大きなロバスト性（robustness）とより便利なキャリブレーションとの見地から、既知の方法と比較して利点を与える。   As already mentioned above, thanks to the above-mentioned features, the insensitivity of the system to disturbances that can occur, for example, due to contact aging in the connection between the valve solenoid and the electronic control unit, for example. ), The method according to the invention is from the standpoint of simplification of the electronic processing means arranged to implement the method and from the standpoint of greater robustness and more convenient calibration. Provides advantages over known methods.

もちろん、本発明の原理を損なうことなく、構造の細部及び実施態様は、本発明の範囲から逸脱することなく、実施例のみとして本願明細書に記述され図示されたものを幅広く変更してもよい。   Of course, structural details and embodiments may vary widely from those described and illustrated herein as examples only, without departing from the scope of the present invention, without departing from the scope of the present invention. .

Ａ：サイクル
Ｂ：最大値
Ｃ：低い閾値
Ｄ：サイクル A: Cycle B: Maximum value C: Low threshold D: Cycle

Claims (4)

内燃機関エンジンの吸気バルブ及び／又は排気バルブを可変駆動するための電気油圧装置で用いられる方法であって、当該方法は、
前記電気油圧装置が複数のエンジンバルブを備え、前記エンジンバルブのそれぞれが、エンジンのカムシャフトによって駆動されたタペットの動きを前記エンジンバルブに伝える加圧油圧チャンバに結合されており、前記加圧油圧チャンバがソレノイドバルブによって排出部と連通しており、
前記ソレノイドバルブの可動要素を移動させて前記加圧油圧チャンバを加圧するために定電圧を印加することによって前記ソレノイドバルブを通電状態にすることと、
バネによってエンジンバルブが閉じることができるように、前記ソレノイドバルブの可動要素を移動させて前記加圧油圧チャンバと排出部とを連通することによって前記加圧油圧チャンバの加圧を解除するためにゼロ電圧を印加することによって前記ソレノイドバルブを非通電状態にすることと、
前記通電状態にすること及び非通電状態にすることによって、定電流値を中心にした電流の増加及び減少に対応する前記ソレノイドバルブの充電相及び放電相の交番が提供され、
定電圧での各相が一定時間の間維持されて、減少した電流が所定値に達したときにゼロ電圧での各相が終了することと、
前記通電状態及び非通電状態からなる各サイクルの期間を絶えずモニターすることと、
少なくとも２つのサイクルの期間をお互いに比較するとともに所定の閾値と比較することと、
前記所定の閾値よりも長い期間によってお互いを区別する二つの連続したサイクルを分離する瞬間として、移動の端の位置に到達する瞬間を同定することと、を備えることを特徴とする方法。 A method used in an electrohydraulic device for variably driving an intake valve and / or an exhaust valve of an internal combustion engine, the method comprising:
The electrohydraulic device includes a plurality of engine valves, and each of the engine valves is coupled to a pressurized hydraulic chamber that transmits a movement of a tappet driven by an engine camshaft to the engine valve, The chamber is in communication with the exhaust by a solenoid valve;
Energizing the solenoid valve by applying a constant voltage to move the movable element of the solenoid valve to pressurize the pressurized hydraulic chamber;
Zero to depressurize the pressurized hydraulic chamber by moving the movable element of the solenoid valve to communicate the pressurized hydraulic chamber and the discharge so that the spring can close the engine valve Deenergizing the solenoid valve by applying a voltage;
By providing the energized state and the non-energized state, an alternating charge phase and discharge phase of the solenoid valve corresponding to an increase and decrease in current centered on a constant current value is provided,
Each phase at constant voltage is maintained for a certain time, and each phase at zero voltage is terminated when the reduced current reaches a predetermined value;
Continuously monitoring the period of each cycle comprising the energized and de-energized states;
Comparing the duration of at least two cycles with each other and with a predetermined threshold;
Identifying the moment of reaching the position of the end of movement as the moment of separating two consecutive cycles that distinguish each other by a period longer than the predetermined threshold. 前記エンジンバルブは、前記ソレノイドバルブの可動要素がエンジンバルブの開いた状態に対応するその移動の端の位置に到達する瞬間を決定するための、通常閉じたソレノイドバルブを備えることを特徴とする、請求項１に記載の方法。   The engine valve comprises a normally closed solenoid valve for determining the moment when the movable element of the solenoid valve reaches its end of movement corresponding to the open state of the engine valve, The method of claim 1. 前記エンジンバルブは、前記ソレノイドバルブの可動要素がエンジンバルブの閉鎖状態に対応するその移動の端の位置に到達する瞬間を決定するための、通常開いたソレノイドバルブを備えることを特徴とする、請求項１に記載の方法。   The engine valve comprises a normally open solenoid valve for determining the moment when the movable element of the solenoid valve reaches its end of movement position corresponding to the closed state of the engine valve. Item 2. The method according to Item 1. 内燃機関エンジンの吸気バルブ及び／又は排気バルブを可変駆動するための電気油圧装置であって、
当該電気油圧装置は、エンジンのカムシャフトによって駆動されたタペットの動きをエンジンバルブに伝える加圧油圧チャンバであって、当該加圧油圧チャンバがソレノイドバルブによって排出部と連通しており、当該連通が確立されたとき、各戻りバネにより前記エンジンバルブの迅速な閉鎖がもたらされ、前記エンジンバルブをその作動カムから独立にする加圧油圧チャンバを備え、
当該電気油圧装置は、ソレノイドの通電に続いてソレノイドバルブの可動要素が移動の端の位置に到達する瞬間を決定するように構成された、前記ソレノイドバルブを制御するための制御手段を備え、
当該制御手段は、定電流値を中心にして電流の増加及び減少に対応した前記ソレノイドの充電相及び放電相の交番を生じさせるように、定電圧での相及びゼロ電圧での相を交互にすることをソレノイドに適用することによって前記可動要素が移動するように構成されており、
前記定電圧での相及びゼロ電圧での相の交互の相は、定電圧での各相が一定時間の間維持されて、減少した電流が所定値に達したときにゼロ電圧での各相が終了するように、あるいは、増加した電流が所定値に達したときに定電圧での相が終了して、ゼロ電圧での相が一定時間の間維持されるように、制御され、
充電相及びその後の放電相からなる各サイクルの期間が、絶えずモニターされ、少なくとも２つのサイクルの期間が、お互いに比較されるとともに所定の閾値と比較されて、移動の端の位置に到達する瞬間は、所定の閾値よりも長い期間でお互いを区別する二つの連続したサイクルを分離する瞬間として同定されることを特徴とする電気油圧装置。 An electrohydraulic device for variably driving an intake valve and / or an exhaust valve of an internal combustion engine,
The electrohydraulic device is a pressurized hydraulic chamber that transmits the movement of the tappet driven by the camshaft of the engine to the engine valve, and the pressurized hydraulic chamber communicates with the discharge portion by a solenoid valve. When established, each return spring provides a quick closure of the engine valve, comprising a pressurized hydraulic chamber that makes the engine valve independent of its operating cam;
The electrohydraulic device comprises control means for controlling the solenoid valve configured to determine the moment when the movable element of the solenoid valve reaches the position of the end of movement following energization of the solenoid;
The control means alternates between a phase at a constant voltage and a phase at a zero voltage so as to cause an alternating charge phase and discharge phase of the solenoid corresponding to an increase and decrease in current around a constant current value. The movable element is configured to move by applying to a solenoid,
The alternating phase of the constant voltage phase and the zero voltage phase means that each phase at a constant voltage is maintained for a certain period of time and each phase at zero voltage is reached when the reduced current reaches a predetermined value. Controlled so that the phase at constant voltage is terminated when the increased current reaches a predetermined value, and the phase at zero voltage is maintained for a certain period of time,
The period of each cycle consisting of the charge phase and the subsequent discharge phase is continuously monitored, and at least two cycle periods are compared to each other and compared to a predetermined threshold to reach the end of travel position Is identified as a moment separating two consecutive cycles that distinguish each other for a period longer than a predetermined threshold.
JP2012095938A 2007-12-18 2012-04-19 Method for determining instant when movable element of solenoid valve reaches its end position following energization of solenoid, by means of analysis of switching frequency of solenoid driving current Pending JP2012167673A (en)

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